EP1094424A3

Digital signing method

Abstract

According to the invention, techniques for authenticating that a digitally signed document is genuine. Specific embodiments according to the present invention can determine whether a digital signature was generated by a digital signature generator, or if the digital signature was generated by a third party posing as the digital signature generator. Specific embodiments can provide independent verification of digital signer identity based upon prior signed messages, time/date stamps, and the like. Techniques according to the present invention can be embodied in methods, apparatus, computer software and systems.

EP1094424A3, drawing sheet 1 — Sheet 1 of 1

Term

Term ended

Projected expiry passed 5 September 2020, 6 years ago.

Parties

Owner: Hitachi, Ltd.
Inventors: Miyazaki, Kunihiko, c/o Hitachi, Ltd., Chiyoda-ku, Tokyo 100-8220, Japan
Sasaki, Ryoichi, c/o Hitachi, Ltd., Int.Prop.Group, Chiyoda-ku, Tokyo 100-8220, Japan
Takaragi, Kazuo, c/o Hitachi, Ltd., Int.Prop.Group, Chiyoda-ku, Tokyo 100-8220, Japan
Susaki, Seiichi, c/o Hitachi, Ltd., Int.Prop.Group, Chiyoda-ku, Tokyo 100-8220, Japan
and 4 more inventorsShow fewer
Moritsu, Toshiyuki, c/o Hitachi, Ltd., Chiyoda-ku, Tokyo 100-8220, Japan
Sakai, Mizuhiro, c/o Hitachi, Ltd., Int.Prop.Group, Chiyoda-ku, Tokyo 100-8220, Japan
Iwamura, Mitsuru, Tokyo, Japan
Matsumoto, Tsutomu, Yokohama-shi, Kanagawa-ken, Japan

Examination

Agent: Strehl Schübel-Hopf & Partner

Reach

Cites: 4 earlier patents⁠
Family: 27 members in 5 offices⁠JP9US9EP6AU2SG

Classification

CPC: H04L9/3297H04L9/321H04L9/3247H04L2209/56
IPC: H04L9 32

1 sheet

Sheet 1

Every citation, both ways

Citations
Document	Relation	Office	Category	Cited during	Relevant claims
EP0484603A1	Cites	European Patent Office (EPO)	X	Search report	1-33
US5214702A	Cites	United States of America	A	Search report	–
US5790669A	Cites	United States of America	A	Search report	1-33
WO9935785A2	Cites	World Intellectual Property Organization (WIPO)	AX	Search report	1-30,32,33

27 members in 5 offices

This recordMember, by publication datePriority claim

Priority claims10

Priority claims
Document	Office	Kind	Date
30121699	Japan	A	1999-10-22
30121699	Japan	A	1999-10-22
30121699	Japan	–	1999-10-22
2000081712	Japan	A	2000-03-17
2000081712	Japan	A	2000-03-17
2000081712	Japan	–	2000-03-17
2000081712	–	–	–
30121699	–	–	–
JP19990301216	–	–	–
JP20000081712	–	–	–

Members27

Family members, oldest first
Document	Office	Kind
EP1094424A2	European Patent Office (EPO)	A2	2001-04-25
JP2001331104A	Japan	A	2001-11-30
US2002023221A1	United States of America	A1	2002-02-21
EP1243999A2	European Patent Office (EPO)	A2	2002-09-25
AU3887901A	Australia	A	2002-09-26
JP2002335241A	Japan	A	2002-11-22
AU758676B2	Australia	B2	2003-03-27
JP2004040830A	Japan	A	2004-02-05
EP1396958A1	European Patent Office (EPO)	A1	2004-03-10
JP2004104750A	Japan	A	2004-04-02
EP1094424A3This record	European Patent Office (EPO)	A3	2004-06-16
US2004123107A1	United States of America	A1	2004-06-24
US2006059357A1	United States of America	A1	2006-03-16
SG120979A1	Singapore	A1	2006-04-26
EP1243999A3	European Patent Office (EPO)	A3	2006-05-17
US7134021B2	United States of America	B2	2006-11-07
JP3873603B2	Japan	B2	2007-01-24
US7305558B1	United States of America	B1	2007-12-04
US2008098232A1	United States of America	A1	2008-04-24
JP2008136247A	Japan	A	2008-06-12
US7441115B2	United States of America	B2	2008-10-21
JP4206674B2	Japan	B2	2009-01-14
US7694126B2	United States of America	B2	2010-04-06
US7770009B2	United States of America	B2	2010-08-03
JP4626136B2	Japan	B2	2011-02-02
JP4853479B2	Japan	B2	2012-01-11
EP1243999B1	European Patent Office (EPO)	B1	2013-03-20

18 legal events, as the office reported them to INPADOC

Over the term

Point at a mark for the event

Events

Legal events, newest first
	Event	Code
2013-01-23	Application deemed to be withdrawnWithdrawn18D	18D
2012-12-21	Information on the status of an ep patent application or granted ep patentGrantedSTATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWNSTAA	STAA
2012-12-14	Appeal procedure closedAppealORIGINAL CODE: EPIDOSNNOA9EAPBT	APBT
2012-06-12	Invitation to file observations in appeal sentAppealORIGINAL CODE: EPIDOSNOBA2EAPBX	APBX
2007-12-18	Appeal reference modifiedAppealORIGINAL CODE: EPIDOSCREFNEAPAF	APAF
2007-11-22	Date of receipt of notice of appeal recordedAppealORIGINAL CODE: EPIDOSNNOA2EAPBN	APBN
2007-11-22	Date of receipt of statement of grounds of appeal recordedAppealORIGINAL CODE: EPIDOSNNOA3EAPBR	APBR
2007-10-03	Request filed for re-establishment of rights before grant18RA	18RA
2007-04-18	Application refused18R	18R
2005-05-25	First examination report despatched17Q	17Q
2005-03-09	Designation fees paidAKX	AKX
2005-02-09	Request for examination filed17P	17P
2004-06-16	Designated contracting statesAK	AK
2004-06-16	Request for extension of the european patentAX	AX
2004-04-30	Search report despatchedORIGINAL CODE: 0009013PUAL	PUAL
2001-04-25	Designated contracting statesAK	AK
2001-04-25	Request for extension of the european patentAL;LT;LV;MK;RO;SIAX	AX
2001-03-09	Public reference made under article 153(3) epc to a published international application that has entered the european phaseORIGINAL CODE: 0009012PUAI	PUAI